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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83faf7d482507efeafce9f110462f31708f301fa4f80453ad1f3293444310c23' 
  AND token = 'MWOPc0Vwnef6GqMsmlH8C60Vr2U0atXN3ns6RjQJadE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}